A construction of continuous-time ARMA models by iterations of Ornstein-Uhlenbeck processes
- Argimiro Arratia 1
- Alejandra Cabaña 2
- Enrique M. Cabaña 3
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1
Universitat Politècnica de Catalunya
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2
Universitat Autònoma de Barcelona
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3
Universidad de la República
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ISSN: 1696-2281
Année de publication: 2016
Volumen: 40
Número: 2
Pages: 267-302
Type: Article
D'autres publications dans: Sort: Statistics and Operations Research Transactions
Résumé
We present a construction of a family of continuous-time ARMA processes based on p iterations of the linear operator that maps a Lévy process onto an Ornstein-Uhlenbeck process. The construction resembles the procedure to build an AR(p) from an AR(1). We show that this family is in fact a subfamily of the well-known CARMA(p,q) processes, with several interesting advantages, including a smaller number of parameters. The resulting processes are linear combinations of Ornstein-Uhlenbeck processes all driven by the same Lévy process. This provides a straightforward computation of covariances, a state-space model representation and methods for estimating parameters. Furthermore, the discrete and equally spaced sampling of the process turns to be an ARMA(p, p−1) process. We propose methods for estimating the parameters of the iterated Ornstein-Uhlenbeck process when the noise is either driven by a Wiener or a more general Lévy process, and show simulations and applications to real data.
Information sur le financement
Supported by Spain's MINECO project APCOM (TIN2014-57226-P) and Generalitat de Catalunya 2014SGR 890 (MACDA). Supported by Spain's MINECO project MTM2015-69493-R.Financeurs
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Generalitat de Catalunya
Spain
- MTM2015-69493-R
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Ministerio de Economía y Competitividad
Spain
- TIN2014-57226-P
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